2145205151321 has 8 divisors (see below), whose sum is σ = 2272698369864. Its totient is φ = 2017856897280.

The previous prime is 2145205151317. The next prime is 2145205151381. The reversal of 2145205151321 is 1231515025412.

It can be written as a sum of positive squares in 4 ways, for example, as 149257822921 + 1995947328400 = 386339^2 + 1412780^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2145205151321 - 2² = 2145205151317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2145205151381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36210650 + ... + 36269843.

It is an arithmetic number, because the mean of its divisors is an integer number (284087296233).

Almost surely, 2^{2145205151321} is an apocalyptic number.

It is an amenable number.

2145205151321 is a deficient number, since it is larger than the sum of its proper divisors (127493218543).

2145205151321 is a wasteful number, since it uses less digits than its factorization.

2145205151321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72482251.

The product of its (nonzero) digits is 12000, while the sum is 32.

The spelling of 2145205151321 in words is "two trillion, one hundred forty-five billion, two hundred five million, one hundred fifty-one thousand, three hundred twenty-one".